/******************************************************************************
 * Copyright 2018 The Apollo Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *****************************************************************************/

#ifndef CYBER_CROUTINE_ROUTINE_CONTEXT_H_
#define CYBER_CROUTINE_ROUTINE_CONTEXT_H_

#include <cstdlib>
#include <cstring>
#include <iostream>

#include "glog/logging.h"

extern "C" {
extern void ctx_swap(void **, void **) asm("ctx_swap");
};

namespace croutine {

constexpr size_t STACK_SIZE = 2 * 1024 * 1024;
constexpr size_t REGISTERS_SIZE = 56;

typedef void (*func)(void *);
struct RoutineContext {
  char stack[STACK_SIZE];
  char *sp = nullptr;
};

void MakeContext(const func &f1, const void *arg, RoutineContext *ctx);

inline void SwapContext(char **src_sp, char **dest_sp) {
  ctx_swap(reinterpret_cast<void **>(src_sp),
           reinterpret_cast<void **>(dest_sp));
}

} // namespace croutine

#endif // CYBER_CROUTINE_ROUTINE_CONTEXT_H_
